Fixes pexm_z as perm_z. Resolves RayTracing#196

Trevor Black · hollasch · commit bf5a14576fb8 · 2019-09-19T05:30:12.000Z
diff --git a/books/RayTracingTheNextWeek.html b/books/RayTracingTheNextWeek.html
@@ -1104,7 +1104,7 @@
                             c[di][dj][dk] = ranfloat[
                                 perm_x[(i+di) & 255] ^
                                 perm_y[(j+dj) & 255] ^
-                                pexm_z[(k+dk) & 255]
+                                perm_z[(k+dk) & 255]
                             ];
                 return trilinear_interp(c, u, v, w);
             }

Original file line number	Diff line number	Diff line change
`@@ -1104,7 +1104,7 @@`
`1104`	`1104`	`c[di][dj][dk] = ranfloat[`
`1105`	`1105`	`perm_x[(i+di) & 255] ^`
`1106`	`1106`	`perm_y[(j+dj) & 255] ^`
`1107`		`- pexm_z[(k+dk) & 255]`
	`1107`	`+ perm_z[(k+dk) & 255]`
`1108`	`1108`	`];`
`1109`	`1109`	`return trilinear_interp(c, u, v, w);`
`1110`	`1110`	`}`